F# lazy pixels reading

Question

I want to make a lazy loading of image pixels to the 3 dimensional array of integers. For example in simple way it looks like this:

   for i=0 to Width 
             


        

Answer 1

As mentioned already by other comments that you can use the lazy pixel loading in the 3D array but that would just make the GetPixel operation lazy and not the memory allocation of the 3D array as the array is allocated already when you call create method of Array3D.

If you want to make the memory allocation as well as GetPixel lazy then you can use sequences as shown by below code:

let getPixels (bmp:Bitmap) =
  seq {
        for i = 0 to bmp.Height-1 do
            yield seq {
                            for j = 0 to bmp.Width-1 do
                                let pixel = bmp.GetPixel(j,i)
                                yield (pixel.R,pixel.G,pixel.B)
                       }
  }